I was just in a nice steakhouse in NYC and sat next to a table of some european guy that was trying very hard to impress his American "date". At the end of their meal he practically shouted at the waiter "Eh, waiter, put a 50% tip on this". After the waiter explained that it it the customer that has to write down the amount of the tip, he literally shouted about his "50% tip" two more times, for the whole restaurant to hear. His "girlfriend" actually seemed embarrassed!

I had a good time watching it all of course